Due to a problem in the Intel® Quartus® Prime Pro Edition software version 20.4, you may see a timing violation after a flat compile of your OpenCL BSP. This is caused by a problem with order in which the .sdc (Synopsys Design Constraints) file is read.
A patch is available to workaround this problem for the Intel® Quartus® Prime Pro Edition software version 20.4. Download and install Patch 0.32pro from the appropriate link below.
Download patch Intel® Quartus® Prime Pro Edition 20.4 Patch 0.32pro for Windows (.exe)
Download patch Intel® Quartus® Prime Pro Edition 20.4 Patch 0.32pro for Linux (.run)
Download the Readme for Intel® Quartus® Prime Pro Edition 20.4 Patch 0.32pro (.txt)
This problem is fixed beginning with the Intel® Quartus® Prime Pro Edition software version 21.1